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The right of self-defense is the first law of nature; ... when the right of the people to keep and bear arms is, under any color or pretext whatsoever, prohibited, liberty, if not already annihilated, is on the brink of destruction." - Henry St. George Tucker, in Blackstone's 1768 "Commentaries on the Laws of England."
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Resistance Training and the Young

At the Arts of Self-Defense dojo of Sensei Di Nardo young students use the Punch/Block Power Charger®with light weights.

The policy of the American Academy of Pediatrics (AAP) outlined below says that resistance training is good for pre-adolescents.  This applies to the Punch/Block Power Charger® since it is a form of resistance training.

Articles in the Journal of Musculoskeletal & Neuronal Interactions in 2003 measured and discussed  the value of resistance training for children.  The work clearly shows physical activity combined with good nutrition, especially calcium, is very beneficial to a child's growth.

Sensei Di Nardo with Students

Sensei Ed Di Nardo (middle) with two of his young students working with the Punch/Block Power Charger® configured as a nigiri game.

Resistance Training for Pre-Adolescents

The American Academy of Pediatrics (AAP) Policy Statement RE0048 of June 2001 (http://www.aap.org/policy/re0048.html) states that weight training can be used by pre-adolescents to improve strength, performance, rehabilitate injuries, and prevent injures. The AAP recommends that pre-adolescents

  Use low-resistance, i.e. low weight, exercises.
  Emphasize proper technique, indeed start with no weights
   Increase weight gradually.
  Workout at least 20 minutes
  Minimum of two times per week

If the child's parents do not know how to guide the child in use of resistance equipment they should get instruction from a trainer or a sensei.
 

The Benefits of Exercise on Bone Growth

The original papers and others can be found at http://www.ismni.org/.  

  "Significant and positive relationship between physical activity and bone mineral accrual during the growing years." "Bone growth and exercise ... " by Bailey et al

  Calcium intake is a major factor in bone growth.  "Role of physical activity ..." by Specker

  Axial compression and torsion or bending forces are both contribute to bone formation but in different ways. "Role of physical activity ..." by Specker

  Exercise during growth has the potential to result in large increase in bone mass that would reduce the risk of fracture if maintained into later life.  "The structural adaptation of cortical bone to loading ..." Bass

 
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